The units can manually be entered and can only be up to 4 characters in length. Typing them manually into the Units cell will mean they are not correctly formatted for use within the Q-Dims window.
To Add/Delete new Units:
Locate Options, Dims Options, Dims Units
To Delete, select unit cell and press Delete Selected Unit
To Add enter the Name, Description, Unit Count (relates to the Q-Dims window and is the number of dims required to total the Qty) Take Off As, Working Precision (Decimal Place), Output Precision.
Press OK to restart and save changes.
Double click the Unit cell in the View window to see the unit list changes.